KRAMATORSK, Ukraine (AP) — Ukraine’s acting president says army troops have restored control over a small airport in eastern Ukraine that had been occupied by pro-Russian militiamen.

It was the first military action taken by the government after acting President Oleksandr Turchynov announced an “anti-terrorist operation” against the separatists who have seized control of numerous buildings in the east of the country.

Heavy gunfire rang out at the airport near Kramatorsk on Tuesday, but there was no immediate confirmation of any casualties.